First experimental evidence of HF produced electron density irregularities in the polar ionosphere, diagnosed by UHF radio star scintillations

Details First experimental evidence of HF produced electron density irregularities in the polar ionosphere, diagnosed by UHF radio star scintillations First experimental evidence of HF produced electron density irregularities in the polar ionosphere, diagnosed by UHF radio star scintillations

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..523f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, May 1984, p. 523-526. Research supported by the Deutsche Forschungsgemei

Physics

25

High Frequencies, Ionospheric Disturbances, Ionospheric Electron Density, Ionospheric Propagation, Polar Regions, Radio Stars, Radio Transmission, Scintillation, Ultrahigh Frequencies

Scientific paper

Observations made on May 10 and September 9, 1983, during which large scale irregularities in the ionosphere were excited by the HF facility at Tromso, Norway, are discussed. The observations were detected using radio star scintillations at 933 MHz, and the HF-beam was pointed 10-15 deg south. Observations made on September 9 showed the HF-power density threshold to be 22 microW/sq m. It was determined that shorter scale irregularities appear to be preferentially produced during lower HF-power and are not the result of cascading from larger scale irregularities. Consequently, HF-power density thresholds for short scale irregularities do not concur with values proposed by Cragin et al. (1977). Also noted were the irregular growth times (about 10-40 sec) and decay times (1-3 min).

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